(I had the same problem with sysdevel/gcc-4.6.3, which is why I downgraded to this version.)

The current working version of gcc is also 4.5.4, as installed by the stage tarball. This re-emerge is a result of some new libraries emerged after my first emerge --sync and emerge -avuND. revdep-rebuild wanted to recompile gcc against the new libmpc.so.2 in order to remove old dependencies.

Does anyone have any idea how I can get gcc to compile on my machine? I've been looking for days in the forums and on Google.